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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A view into a single entry in a map, which may either be vacant or occupied, with any borrowed form of the map’s key type."><title>EntryRef in hashbrown::hash_map - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-492a78a4a87dcc01.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="hashbrown" data-themes="" data-resource-suffix="" data-rustdoc-version="1.82.0 (f6e511eec 2024-10-15)" data-channel="1.82.0" data-search-js="search-a99f1315e7cc5121.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-3b12f09e550e0385.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc enum"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../hashbrown/index.html">hashbrown</a><span class="version">0.15.0</span></h2></div><h2 class="location"><a href="#">Entry<wbr>Ref</a></h2><div class="sidebar-elems"><section><h3><a href="#variants">Variants</a></h3><ul class="block variant"><li><a href="#variant.Occupied">Occupied</a></li><li><a href="#variant.Vacant">Vacant</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.and_modify">and_modify</a></li><li><a href="#method.insert">insert</a></li><li><a href="#method.key">key</a></li><li><a href="#method.or_default">or_default</a></li><li><a href="#method.or_insert">or_insert</a></li><li><a href="#method.or_insert_with">or_insert_with</a></li><li><a href="#method.or_insert_with_key">or_insert_with_key</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-EntryRef%3C'_,+'_,+K,+Q,+V,+S,+A%3E">Debug</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-UnwindSafe-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E">!UnwindSafe</a></li><li><a href="#impl-Freeze-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E">RefUnwindSafe</a></li><li><a href="#impl-Send-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E">Send</a></li><li><a href="#impl-Sync-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E">Sync</a></li><li><a href="#impl-Unpin-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow&#60;T&#62;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut&#60;T&#62;</a></li><li><a href="#impl-From%3CT%3E-for-T">From&#60;T&#62;</a></li>
A: Allocator,</div>{
Occupied(<a class="struct" href="struct.OccupiedEntry.html" title="struct hashbrown::hash_map::OccupiedEntry">OccupiedEntry</a>&lt;'a, K, V, S, A&gt;),
Vacant(<a class="struct" href="struct.VacantEntryRef.html" title="struct hashbrown::hash_map::VacantEntryRef">VacantEntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;),
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A view into a single entry in a map, which may either be vacant or occupied,
with any borrowed form of the map’s key type.</p>
<p>This <code>enum</code> is constructed from the <a href="struct.HashMap.html#method.entry_ref"><code>entry_ref</code></a> method on <a href="struct.HashMap.html"><code>HashMap</code></a>.</p>
<p><a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form of the map’s key type <em>must</em> match those
for the key type. It also require that key may be constructed from the borrowed
form through the <a href="https://doc.rust-lang.org/std/convert/trait.From.html"><code>From</code></a> trait.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::hash_map::{EntryRef, HashMap, OccupiedEntry};
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
map.extend([(<span class="string">"a"</span>.to_owned(), <span class="number">10</span>), (<span class="string">"b"</span>.into(), <span class="number">20</span>), (<span class="string">"c"</span>.into(), <span class="number">30</span>)]);
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
<span class="comment">// Existing key (insert)
</span><span class="kw">let </span>key = String::from(<span class="string">"a"</span>);
<span class="kw">let </span>entry: EntryRef&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>&gt; = map.entry_ref(<span class="kw-2">&amp;</span>key);
<span class="kw">let </span>_raw_o: OccupiedEntry&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>&gt; = entry.insert(<span class="number">1</span>);
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
<span class="comment">// Nonexistent key (insert)
</span>map.entry_ref(<span class="string">"d"</span>).insert(<span class="number">4</span>);
<span class="comment">// Existing key (or_insert)
</span><span class="kw">let </span>v = map.entry_ref(<span class="string">"b"</span>).or_insert(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(std::mem::replace(v, <span class="number">2</span>), <span class="number">20</span>);
<span class="comment">// Nonexistent key (or_insert)
</span>map.entry_ref(<span class="string">"e"</span>).or_insert(<span class="number">5</span>);
<span class="comment">// Existing key (or_insert_with)
</span><span class="kw">let </span>v = map.entry_ref(<span class="string">"c"</span>).or_insert_with(|| <span class="number">3</span>);
<span class="macro">assert_eq!</span>(std::mem::replace(v, <span class="number">3</span>), <span class="number">30</span>);
<span class="comment">// Nonexistent key (or_insert_with)
</span>map.entry_ref(<span class="string">"f"</span>).or_insert_with(|| <span class="number">6</span>);
<span class="macro">println!</span>(<span class="string">"Our HashMap: {:?}"</span>, map);
<span class="kw">for </span>(key, value) <span class="kw">in </span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"d"</span>, <span class="string">"e"</span>, <span class="string">"f"</span>].into_iter().zip(<span class="number">1</span>..=<span class="number">6</span>) {
<span class="macro">assert_eq!</span>(map[key], value)
}
<span class="macro">assert_eq!</span>(map.len(), <span class="number">6</span>);</code></pre></div>
</div></details><h2 id="variants" class="variants section-header">Variants<a href="#variants" class="anchor">§</a></h2><div class="variants"><section id="variant.Occupied" class="variant"><a href="#variant.Occupied" class="anchor">§</a><h3 class="code-header">Occupied(<a class="struct" href="struct.OccupiedEntry.html" title="struct hashbrown::hash_map::OccupiedEntry">OccupiedEntry</a>&lt;'a, K, V, S, A&gt;)</h3></section><div class="docblock"><p>An occupied entry.</p>
<h4 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::hash_map::{EntryRef, HashMap};
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw">_</span>, <span class="kw">_</span>&gt; = [(<span class="string">"a"</span>.to_owned(), <span class="number">100</span>), (<span class="string">"b"</span>.into(), <span class="number">200</span>)].into();
<span class="kw">match </span>map.entry_ref(<span class="string">"a"</span>) {
EntryRef::Vacant(<span class="kw">_</span>) =&gt; <span class="macro">unreachable!</span>(),
EntryRef::Occupied(<span class="kw">_</span>) =&gt; { }
}</code></pre></div>
</div><section id="variant.Vacant" class="variant"><a href="#variant.Vacant" class="anchor">§</a><h3 class="code-header">Vacant(<a class="struct" href="struct.VacantEntryRef.html" title="struct hashbrown::hash_map::VacantEntryRef">VacantEntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;)</h3></section><div class="docblock"><p>A vacant entry.</p>
<h4 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::hash_map::{EntryRef, HashMap};
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, i32&gt; = HashMap::new();
<span class="kw">match </span>map.entry_ref(<span class="string">"a"</span>) {
EntryRef::Occupied(<span class="kw">_</span>) =&gt; <span class="macro">unreachable!</span>(),
EntryRef::Vacant(<span class="kw">_</span>) =&gt; { }
}</code></pre></div>
</div></div><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4116-4296">source</a><a href="#impl-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, V, S, A: Allocator&gt; <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.insert" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4130-4142">source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>(self, value: V) -&gt; <a class="struct" href="struct.OccupiedEntry.html" title="struct hashbrown::hash_map::OccupiedEntry">OccupiedEntry</a>&lt;'a, K, V, S, A&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'b Q</a>&gt;,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Sets the value of the entry, and returns an <code>OccupiedEntry</code>.</p>
<h5 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, u32&gt; = HashMap::new();
<span class="kw">let </span>entry = map.entry_ref(<span class="string">"horseyland"</span>).insert(<span class="number">37</span>);
<span class="macro">assert_eq!</span>(entry.key(), <span class="string">"horseyland"</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.or_insert" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4163-4172">source</a><h4 class="code-header">pub fn <a href="#method.or_insert" class="fn">or_insert</a>(self, default: V) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'a mut V</a><div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'b Q</a>&gt;,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Ensures a value is in the entry by inserting the default if empty, and returns
a mutable reference to the value in the entry.</p>
<h5 id="examples-4"><a class="doc-anchor" href="#examples-4">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, u32&gt; = HashMap::new();
<span class="comment">// nonexistent key
</span>map.entry_ref(<span class="string">"poneyland"</span>).or_insert(<span class="number">3</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">3</span>);
<span class="comment">// existing key
</span><span class="kw-2">*</span>map.entry_ref(<span class="string">"poneyland"</span>).or_insert(<span class="number">10</span>) <span class="kw-2">*</span>= <span class="number">2</span>;
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">6</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.or_insert_with" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4193-4202">source</a><h4 class="code-header">pub fn <a href="#method.or_insert_with" class="fn">or_insert_with</a>&lt;F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -&gt; V&gt;(self, default: F) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'a mut V</a><div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'b Q</a>&gt;,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Ensures a value is in the entry by inserting the result of the default function if empty,
and returns a mutable reference to the value in the entry.</p>
<h5 id="examples-5"><a class="doc-anchor" href="#examples-5">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, u32&gt; = HashMap::new();
<span class="comment">// nonexistent key
</span>map.entry_ref(<span class="string">"poneyland"</span>).or_insert_with(|| <span class="number">3</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">3</span>);
<span class="comment">// existing key
</span><span class="kw-2">*</span>map.entry_ref(<span class="string">"poneyland"</span>).or_insert_with(|| <span class="number">10</span>) <span class="kw-2">*</span>= <span class="number">2</span>;
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">6</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.or_insert_with_key" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4224-4236">source</a><h4 class="code-header">pub fn <a href="#method.or_insert_with_key" class="fn">or_insert_with_key</a>&lt;F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;Q</a>) -&gt; V&gt;(self, default: F) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'a mut V</a><div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;Q&gt; + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'b Q</a>&gt;,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Ensures a value is in the entry by inserting, if empty, the result of the default function.
This method allows for generating key-derived values for insertion by providing the default
function an access to the borrower form of the key.</p>
<h5 id="examples-6"><a class="doc-anchor" href="#examples-6">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, usize&gt; = HashMap::new();
<span class="comment">// nonexistent key
</span>map.entry_ref(<span class="string">"poneyland"</span>).or_insert_with_key(|key| key.chars().count());
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">9</span>);
<span class="comment">// existing key
</span><span class="kw-2">*</span>map.entry_ref(<span class="string">"poneyland"</span>).or_insert_with_key(|key| key.chars().count() * <span class="number">10</span>) <span class="kw-2">*</span>= <span class="number">2</span>;
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">18</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.key" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4253-4261">source</a><h4 class="code-header">pub fn <a href="#method.key" class="fn">key</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;Q</a><div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;Q&gt;,</div></h4></section></summary><div class="docblock"><p>Returns a reference to this entry’s key.</p>
<h5 id="examples-7"><a class="doc-anchor" href="#examples-7">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, u32&gt; = HashMap::new();
map.entry_ref(<span class="string">"poneyland"</span>).or_insert(<span class="number">3</span>);
<span class="comment">// existing key
</span><span class="macro">assert_eq!</span>(map.entry_ref(<span class="string">"poneyland"</span>).key(), <span class="string">"poneyland"</span>);
<span class="comment">// nonexistent key
</span><span class="macro">assert_eq!</span>(map.entry_ref(<span class="string">"horseland"</span>).key(), <span class="string">"horseland"</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.and_modify" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4284-4295">source</a><h4 class="code-header">pub fn <a href="#method.and_modify" class="fn">and_modify</a>&lt;F&gt;(self, f: F) -&gt; Self<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;mut V</a>),</div></h4></section></summary><div class="docblock"><p>Provides in-place mutable access to an occupied entry before any
potential inserts into the map.</p>
<h5 id="examples-8"><a class="doc-anchor" href="#examples-8">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, u32&gt; = HashMap::new();
map.entry_ref(<span class="string">"poneyland"</span>)
.and_modify(|e| { <span class="kw-2">*</span>e += <span class="number">1 </span>})
.or_insert(<span class="number">42</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">42</span>);
map.entry_ref(<span class="string">"poneyland"</span>)
.and_modify(|e| { <span class="kw-2">*</span>e += <span class="number">1 </span>})
.or_insert(<span class="number">42</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">43</span>);</code></pre></div>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E-1" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4298-4329">source</a><a href="#impl-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E-1" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a>, S, A: Allocator&gt; <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.or_default" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4319-4328">source</a><h4 class="code-header">pub fn <a href="#method.or_default" class="fn">or_default</a>(self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'a mut V</a><div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;'b Q</a>&gt;,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Ensures a value is in the entry by inserting the default value if empty,
and returns a mutable reference to the value in the entry.</p>
<h5 id="examples-9"><a class="doc-anchor" href="#examples-9">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;String, <span class="prelude-ty">Option</span>&lt;u32&gt;&gt; = HashMap::new();
<span class="comment">// nonexistent key
</span>map.entry_ref(<span class="string">"poneyland"</span>).or_default();
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="prelude-val">None</span>);
map.insert(<span class="string">"horseland"</span>.to_string(), <span class="prelude-val">Some</span>(<span class="number">3</span>));
<span class="comment">// existing key
</span><span class="macro">assert_eq!</span>(map.entry_ref(<span class="string">"horseland"</span>).or_default(), <span class="kw-2">&amp;mut </span><span class="prelude-val">Some</span>(<span class="number">3</span>));</code></pre></div>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-EntryRef%3C'_,+'_,+K,+Q,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2942-2955">source</a><a href="#impl-Debug-for-EntryRef%3C'_,+'_,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, Q, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'_, '_, K, Q, V, S, A&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;Q&gt;,
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>,
A: Allocator,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2949-2954">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.82.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="impl"><a href="#impl-Freeze-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;<div class="where">where
Q: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section><section id="impl-RefUnwindSafe-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="impl"><a href="#impl-RefUnwindSafe-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="impl"><a href="#impl-Send-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section><section id="impl-Sync-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="impl"><a href="#impl-Sync-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section><section id="impl-Unpin-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="impl"><a href="#impl-Unpin-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;<div class="where">where
Q: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section><section id="impl-UnwindSafe-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="impl"><a href="#impl-UnwindSafe-for-EntryRef%3C'a,+'b,+K,+Q,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b, K, Q, V, S, A = Global&gt; !<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a>&lt;'a, 'b, K, Q, V, S, A&gt;</h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#138">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#139">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#209">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#211">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#217">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#218">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#809">source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#794">source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>
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